Brush unit.



A. E. DOIVIANl BRUSH UNIT.

APPLICATION FILED IUIIE 8.1916.

1 ,272,637. Patented Ju1y16,1918.

UNITED STATES ATENE oEEIcE.

ALBERT E. DOMAN, F ELBRIDGE, NEW YORK, ASSIGNOB, BY MESNE ASSIGNMENTS, T0 DYNETO ELECTRIC CGRPORATION, OF SYRACUSE, NEW YORK, A CORPORATION 0F NEW YGRX.

BRUSH UNIT.

specification er Letters Patent.

Application iiee I une 8, 19%. Serial No. 102,490.

To aZZ whom t may concern:

Be it known that I, AinEnT E. DOMAN,

a citizen of the United States, and resident of Elbridge, in the county of nondaga, in

the State of New York, have invented new and useful Improvementsdn Brush Units, of which the following, taken in connection with the accompanying drawings, is a full,

clear, and exact description.

This invention relates to certain improvements in brush units particularly adapted for use in electrical apparatus, such as dynamo electric machines, motors, motor generators, and the like, and has a particular application to such electrical apparatus as is used in connection with starting and lighting systems for automobiles and the like.

An object of the invention is to produce a one piece brush-carrying unit of molded insulating material which can be economically manufactured and which cannot be improperly assembled or put out of adjustment, and eliminating entirely the possibility of corrosion tending to lock the brushes in their holders, and of short circuits apt to occur with metallic brush holders.

A further object is to shape the unit in segmental form so that it can be readily removed as a whole from the assemblage as it could not be if it inclosed the shaft.

A further object is to prevent turning or spinning of the brushes, particularly the center or third brushes, and to assure their insertion in the holder in proper position by forming them of rectangular shape and permitting their independent operation by spacing them and their controlling springs with a metal insert. y

Another object relates to the ready removability of all the brushes from the unit, and to the construction of the main brush springs in such manner that they will retain the brushes in retracted position in their holders if desired.

Other objects and advantages will appear in the following description, taken in connection with the accompanying drawings, in Which- Figure 1 is an inverted elevation of the unit.

Fig. 2 is a top plan view of the same.

terial embodying prefera Fig. 3 is a cross section on line 3 3, Fig. 2.

Fig. 4- 1s a section on line 4-4, Fig. 2.

Fig. 5 1s a section on line 5 5, Fig. l.

Flg. is a section on line 6 6, Fi 1.

.The invention comprises, in com ination with a dynamo electric or similar machine, a segmental molded brush unit' formed of fibrous or other non-fran ible insulating maly a flat segmental base l and in this instance three upstanding radially disposed tubular brush holders 2 3 and 4 res ectively. The holders 2 and 4 are a a ted to shdably receive and guide the main rushes and 6 each of said holders havlng its vertical walls at the rear provided with alined recesses 9 and 10 in which springs 7 and 8 respectively, are adapted to move following the brushes 5- and 6 respectively, as they are Worn away.

These main brushes may be retracted in their holders and held in that position as shown in dotted lines Fig. 2, by the springs 7 and 8 if desired. These main springs may be shaped as shown, and have 'one end secured to and are coiled about posts 11 The posts 11- are formed with tubular ends 12- externally' threaded for engagement with bosses 13 formed on and integral with the base 1 and internally threaded for coaction with said post. The tubular ends of posts ll are also internally threaded for engagement with threaded screws M having insulating Washers 15 mounted thereon for suitable engagement with an insulating plate 16 all of which parts are secured together by the threaded engagement of said posts and screws.

Suitable conductors, as Wires 17- and 18 are secured to each of brushes 5 and 6 beneath the washer or head 19 of a tubular eyelet or rivet passed through' and counter-sunk in opposite sides of the brushes and permanently secured to said brushes, and these conductors preferably lie in diagonally disposed lchannels 21 and 22 in said brushes and have their opposite ends electrically connected to binding posts 23 adjustably engaged with the base -1- and the binding posts -23 in turn are connected to the main leads -24-.

The holder 3- is provided with a horizontal partition or insert -25- dividing it into a pair of rectangular guideways for receiving the brush springs 26- and -27- and the brushes Q8- and -29 of rectangular form to fit the guideways. The springs -26- and -27. bear at the rear against a removable metallic cap or cap late -30- which serves as a connection for the brush holder lead 31-, and preferably the cap is provided with a pair of open sided slots 3Q- and -33- in which suitable headed pins 34.- and -35--, adJustably secured to the holder -3, are adapted to slide.

Although I have shown and described a particular construction and arrangement of the parts in accomplishing the ob]ects of this invention, I do not desire to limit myself to any particular construction, number, shape or formation ot parts, .as many changes may be made in the details of each of the saine without departing from the spirit of this invention as set forth in the appended claims.

WhatI claim is:

l. In a dynamo electric machine, a brush unit comprisin a molded insulating base, having a centra upstanding tubular ange, a pair of brushes in said tubular iange, means for separating the said brushes, separate springs for moving said brushes inwardly, a removable cap for holding the springs in operative position, Said molded base provided with additional upstanding tubular flanges arranged respectively upon opposite sides of said central 'iange, a brush arranged in each of said additional flanges and spring means for holding said brushes in operative position.

2. In a device of the class described a brush unit formedk of a single piece of insulating material and comprising a base formed with a plurality of upstanding brush-holders provided with substantially radial bores, said base provided with hollow bosses at opposite sides of said brush-holders, posts secured in said hollow bosses and sprin bars having one of their ends secured to said posts and their other ends positioned at the rear of oppositely disposed brush-holders, respectively.

3. In a brush-holder unit a segmental molded insulating base having integral therewith a series of upstanding tubular brush-holders and hollow bosses positioned at opposite sides of said brush-holders and projecting upwardly from said base.

4. A brush-holder unit comprising a onepiece segmental insulating base having inte- I Lavaca? gral therewith a tubular upstanding brushholder, and hollow bosses positioned at opposite sides of said brush-holder and projecting upwardly from said base.

5. A brush unit comprising a one-piecel segmental insulating base embodying a plurality of tubular brush-holders, brushes in said brush-holders, posts mounted on the insulating base, and springs mounted on said posts and bea-ring against the brushes, respectively.

6. In 'a dynamo electric machine, a brush unit comprising a one-piece insulatin base having a central upstanding hollow rushholder, said base provided With additional integral upstanding tubular brush-holders arran ed, respectively, upon opposite sides of said central brush-holder, a brush arranged in each of said brush-holders, and separate spring means for holding each of said brushes in operative position.

7. In a dynamo electric machine, a brush unit comprising a one-piece insulating base Y i' having a central upstanding hollow brushholder, said base provided with additional integral upstanding tubular brush-holders arranged, respectively, upon opposite sides of said central brush-holder, a brush arranged in each of said brush-holders', said base provided with inte ral hollow bosses at opposite sides of said a ditional brush-holders and upon opposite sides of the central brush-holder, posts mounted in said bosses, a sprin mounted on each post and having portions in contact with the respective brushes arranged in said additional brush-holders, respectively, a plate in contact with'said-in sulating base, and screws extending through said plate through the insulating base and engaged with said posts.

9. In a dynamo electric machine, a brush unit comprising an insulatin base embodying a plurality of brusholders, posts mounted on said base, springs mounted on said 'posts for holding the brushes in opA erative position, an insulating plate 1n contact with said base, said plate pro-I vided With depressions alined with said In Witness whereof I have hereunto set posts, screwshextlending thlough said demy hand this 3rd day of June, 1916.

pressions in t e p ate throng the insulatino' buse and engaged with said posts, respeot ALBERT E' DOMAN' 5 tively, and insulating Washers on said screws Witnesses:

having portions adapted to t Within the de- A. M. CATALY,

pressions in said plate. GLENN C. BoRs'r. 

